[Bug 1144] virtio may lost pkts when pmd rxq less than virtio-max_queue_pairs

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1144

            Bug ID: 1144
           Summary: virtio may lost pkts when pmd rxq less than
                    virtio-max_queue_pairs
           Product: DPDK
           Version: 22.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: vhost/virtio
          Assignee: dev at dpdk.org
          Reporter: 1031265646 at qq.com
  Target Milestone: ---

when virtio pmd starts, a virtio-func named modern_setup_queue will set rxq num
to hw. let's suppose 4 rxqs in hw-virtio. but a dpdk-process starts use only 2
rxqs, however hw doesn't aware this, pkts will send to 4 rxqs all the same, but
dpdk-process would only poll 2 rxqs which result to a pkts loss. cuz the pkts
send to the other 2 unused rxqs will never be consumed.

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